Funny you should mention a fan, i have one going every night summer and winter, i cannot sleep without it now, ye i enjoy the sound of it too.

And for opening a can of soda, well i can relate to that , we have this lovely drink called Chi here, it is a carbonated drink with chinese herbs and kiwifruit etc in it and my favourite, i have mentioned it before, and when you open it , it makes that noise like when you say Chi, i also love the sound of that, so no you are not so weird, or else i am too lol.